C++ versus Java performance [closed]

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Say theoretically you just generate random numbers [using standard libraries] in as many threads as you can [bound by hardware]. How fast would C++ over Java?

no disk i/o, memory or gc. Just pure Math.random() calls across threads.

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Depends on hardware, OS and many other factors... I think this a very hard question to answer, cause there is too many variables involved. Why don't you test it?

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Test it. And Pay attention to the fact, that Java performance is not static above runtime. Because it can use a hot spot compiler, that compiles the hot spots after it detects them.

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test both in the environment you will be deploying at.